Spiral internal broaching machine

The invention discloses a spiral internal broaching machine, which comprises a broaching machine main body, the lower part of the broaching machine main body is provided with a lower cutter holder for clamping a cutter, the lower cutter holder is connected with a first driving piece for driving the cutter to rotate around the vertical central axis of the cutter, and the broaching machine main body is provided with two guide rods which vertically extend; the workbench is used for supporting and fixing a workpiece and enabling the workpiece to be vertically aligned with the lower cutter holder, and the workbench is provided with two sliding holes matched with the two guide rods in a sliding mode respectively; the two second driving pieces are both connected with the workbench and used for applying vertical driving force to the workbench so that the workbench can vertically slide along the guide rod; the two guide rods and the two second driving parts are symmetrically arranged relative to the rotating center ax